improvement(posthog): improve posthog config to be more lightweight (… #8546

Job	Run time
Test and Build / Test and Build	3m 59s
Detect Version	4s
Check Docs Changes	-1s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	8m 24s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	3m 6s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	3m 17s
Build ARM64 (GHCR Only)	-1s
Process Docs	0s
Create GHCR Manifests	0s
	18m 48s

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